18 



DB. F. E. BEDDARD ON 



and the fact that the spaces in the meshwork are often approxi- 

 mately circular in transverse section, it is not always easy to 

 detect the water-vascular tubes. They are, however, often quite 

 easy to see, and in such cases I have seen two on each side — a 



Text-fig. 4. 



,Vt.g. 



I.m. 





Ifc 



U 



Transverse section throngli the stroblla of IcUliyotcBnia {AoantJwicBnia) varia. 

 l.v. Dorsal water-vasculav tube. I.m. Layer of delicate longitndinal nruscles lying 

 between cuticnlar and cellular subcorticular layer. T. lestis.^fF. Cavity of 

 uterus, vt.ff. Vitelline gland, v.v. Ventral water-vascular tube. 



